preserve · Preserve

How to Make Yogurt at Home

Making yogurt at home requires just milk and a starter culture. Heat milk to 180°F, cool to 110°F, whisk in starter, then incubate at warm temperature for 4-12 hours until thick and tangy. The longer it sits, the more tart it becomes.

Total time: 4 hr 30 min
Hands-on: 30 min
Serves: 4
Difficulty: Easy

Ingredients

4 cups whole milk
2 tablespoons plain yogurt with live cultures

Step by step

Heat the milk. Pour 4 cups whole milk into a heavy-bottomed saucepan. Heat over medium heat, stirring occasionally, until it reaches 180°F on a thermometer. The milk will steam and tiny bubbles will form around the edges. This kills any competing bacteria.
Cool the milk. Remove from heat and let cool to 110°F. This takes about 30 minutes at room temperature. You can speed it up by placing the pan in an ice bath, stirring occasionally. The milk should feel warm but not hot when you dip your finger in.
Add the starter. Whisk 2 tablespoons plain yogurt with live cultures into a small amount of the warm milk until smooth. Then whisk this mixture back into the rest of the milk. The starter provides the beneficial bacteria that will ferment the milk.
Incubate the yogurt. Pour the mixture into clean jars or keep in the pot. Cover and place in a warm spot around 110°F. Use your oven with just the light on, a dehydrator, or wrap in towels near a heating vent. Keep temperature steady.
Let it culture. Leave undisturbed for 4-12 hours. Check after 4 hours by gently tilting the container. It's ready when it holds together like gel and tastes tangy. Longer culturing creates more tartness and thickness.
Chill and store. Refrigerate immediately once it reaches your desired thickness and flavor. The yogurt will continue to thicken as it cools. It keeps for up to 2 weeks in the refrigerator.

Tips & troubleshooting

Save 2 tablespoons of your finished yogurt as starter for the next batch
Use a thermometer for accuracy - temperature matters more than timing
Don't disturb the yogurt while it's culturing or it may not set properly
Whole milk creates the richest texture, but 2% milk works too
If your yogurt separates, whisk it smooth before refrigerating

Variations

Greek Yogurt. After culturing, strain through cheesecloth or coffee filters for 2-4 hours to remove whey. This creates thick, creamy Greek-style yogurt.
Non-Dairy Yogurt. Use coconut milk, almond milk, or oat milk with the same process. Add 1 tablespoon cornstarch or tapioca starch per cup of milk for better texture.
Instant Pot Method. Use the yogurt function: heat milk using normal setting, cool to 110°F, add starter, then use yogurt setting for 4-8 hours.

Questions

Why didn't my yogurt set?: Usually temperature issues. The milk was too hot when you added starter (killing the bacteria), too cool during incubation, or the starter was old and inactive. Check your thermometer and use fresh starter.
Can I use store-bought yogurt as starter?: Yes, but choose plain yogurt with live active cultures listed on the label. Greek yogurt works well. Avoid flavored yogurts or those with additives that might interfere with culturing.
How do I know when it's done?: Gently tilt the container. Set yogurt will move as one piece like gelatin. Taste it - it should be tangy and slightly thick. If it's still liquid after 12 hours, start over with fresh starter.
Can I make yogurt without a thermometer?: It's challenging but possible. Heat milk until it steams and bubbles form at edges, then cool until you can comfortably keep your finger in it for 10 seconds. This approximates 110°F.